Castell’s Trapped Key Interlocks allow for in excess of 50,000 combinations. With this level of available codes, entire factories and plants can have trapped key systems without codes being repeated.

The steps towards creating a trapped key solution with access by personnel would require an application for either part body of full body. This is just one example of many types of solutions.

1. Isolation: Releasing a key from the disconnector when it is in the open position thus isolating the disconnector.
2. Key Exchange: If necessary this key can be inserted into a key exchange box to release multiple keys.
3. Access Control:
   a. Part Body; has only one lock and the isolation key is used to open this. Whilst the access lock is open the key cannot be removed and therefore the process cannot be started. Only once the lock is closed can the isolation key be removed and the process restarted.
   b. Full Body; has two locking mechanisms, the first step in the process is to insert the isolation key. This will allow the personnel key to be removed and then access can be granted by opening the bolt. The isolation key can only be removed once the personnel key has been inserted. Therefore whilst the personnel key is removed and the lock is open the process cannot be started. Only once the lock is closed and the personnel key returned, can the isolation key be removed and the process restarted.

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